Tag Archives | Phylum Mollusca

Respiratory Organs of Phylum Mollusca and Its Modification

1. Skin and mantle. 2. Molluscan gills or ctenidia or branchiae and 3. Lungs or pulmonary sac. The outer covering of the body (skin) and mantle usually act as accessory respiratory organs. 1. Skin and Mantle — as Respiratory Organs: Skin appears to be the simplest type of respiratory structure encountered in Mol­luscs. It acts as a respiratory organ in [...]

By |2016-05-27T11:34:09+00:00May 27, 2016|Phylum Mollusca|Comments Off on Respiratory Organs of Phylum Mollusca and Its Modification

Economic Importance of Phylum Molluscs

1. Edible Molluscs: (i) Edible Oysters: From ancient times the Romans and Greeks used the oysters as a main dish in their meals. The Red Indians were great oyster eaters. The maximum amount of oys­ter meats are collected from two genera— Ostrea and Crassostrea, which belong to the family Ostreidae and class Bivalvia. In Japan, United States and Europe over [...]

By |2016-05-27T11:34:09+00:00May 27, 2016|Phylum Mollusca|Comments Off on Economic Importance of Phylum Molluscs

Foot of Phylum Mollusca: Origin, Structure and Modifications

Meaning and Origin of Foot: Phylum Mollusca is characterised by the pronounced development of musculature known as the foot. It is the locomotory organ in Molluscs. This organ is quite uncommon and strange to others. It is regarded as the remnant of the 'dermo-muscular tube' of the ancestral form whose ventral side became greatly developed as an adaptation for creep­ing [...]

By |2016-05-27T11:34:09+00:00May 27, 2016|Phylum Mollusca|Comments Off on Foot of Phylum Mollusca: Origin, Structure and Modifications
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